Water quality for ZIP code 57730
ZIP 57730 covers Custer in Custer County, South Dakota, one of 4 ZIP codes in the county. 51 active public water systems serve the county; 13 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Custer County
10 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Custer Custer |
1,919 | 0 | 3.9 mi | |
| Rock Ridge Court Rapid City |
74 | 5 | 5.1 mi | |
| Heartland Country Ranchettes Black Hawk, Hermosa |
95 | 0 | 20.2 mi | |
| Fairburn Water Association Fairburn |
65 | 3 | 22.1 mi | |
| Buffalo Gap Buffalo Gap |
126 | 3 | 23.2 mi | |
| Paramount Point Hot Springs |
40 | 0 | 23.6 mi | |
| Hermosa Water Users Association Hermosa |
108 | 1 | 24.0 mi | |
| North Hermosa Wud Hermosa |
40 | 3 | 24.0 mi | |
| Hermosa-Old System Hermosa, Hill City |
420 | 1 | 24.1 mi | |
| Spring Creek Acres Black Hawk, Hot Springs |
172 | 0 | 27.7 mi |
Non-community systems in Custer County (40: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Custer County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Dakota records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.